In those twelve seconds Molly's whole body is on fire and she's lost most coherent thought. So while she starts to protest when he moves away, when she realizes why, she's relieved. It suddenly registers that her legs are turning to quickly to jelly. She's also stunned when she realizes how he's chosen to get her to move where he wants her. She's not sure any of her lovers have thought to pull her by her knickers. It's ridiculously hot.

"Christ, Sherlock," she breathes out, body flushed from head to toe, as she moves forward and straddles his lap. "I'm starting to doubt your assertion that you've not done this before."

She knows the last thing he needs is to be cocky about something else, but he's earning the right at this point.